Method for producing fluorine-containing rubber molded article

Patent metadata

Field	Value
Publication number	US-9416234-B2
Application number	US-200913062718-A
Country	US
Kind code	B2
Filing date	Sep 7, 2009
Priority date	Sep 9, 2008
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

There is provided a crosslinkable fluorine-containing rubber composition being capable of giving a fluorine-containing rubber crosslinked and molded article having a low friction coefficient and assuring an increased proportion of a fluorine-containing resin around the surface of a fluorine-containing rubber, a molded article obtained by crosslinking the composition, and a method for producing the molded article. The crosslinkable fluorine-containing rubber composition comprises a fluorine-containing rubber (A) comprising vinylidene fluoride unit, a fluorine-containing resin (B) and a polyol crosslinking agent (C),
wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneaded at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B).

First claim

The invention claimed is:

1. A sliding member obtained by heating a crosslinked molded article at a temperature of not less than 225° C. and not more than 250° C. for a time between 1 hour and 24 hours,
wherein the crosslinked molded article is obtained by crosslinking a crosslinkable fluorine-containing rubber composition comprising a fluorine-containing rubber (A) comprising vinylidene fluoride unit, the fluorine-containing resin (B) and a polyol crosslinking agent (C),
wherein the vinylidene fluoride unit in the fluorine-containing rubber (A) is present in an amount of 58 mol % to 85 mol %,
wherein the fluorine-containing resin (B) is a copolymer of tetrafluoroethylene/ethylene/2,3,3,4,4,5,5-heptafluoro-1-pentene comprising 2,3,3,4,4,5,5-heptafluoro-1-pentene in an amount of from 0.1 to 5 mol % or a copolymer of tetrafluoroethylene/ethylene/1,1,2-trihydroperfluorohexene-1 comprising 1,1,2-trihydroperfluorohexene-1 in an amount of from 0.1 to 5 mol %,
wherein the mass ratio (A)/(B) of the fluorine-containing rubber (A) to the fluorine-containing resin (B) is 60/40 to 97/3,
wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneaded at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B), thereby preparing the crosslinkable fluorine-containing rubber composition,
wherein the ratio (P IR0.5 1/P IR0.5 2) of peak (P IR0.5 1) of characteristic absorption derived from the fluorine-containing rubber (A) in 0.5 μm depth from the surface of the sliding member to peak (P IR0.5 2) derived from the fluorine-containing resin (B) is smaller than a ratio (P IR1.2 1/P IR1.2 2) in 1.2 μm depth.

2. A non-sticking member obtained by heating a crosslinked molded article at a temperature of not less than 225° C. and not more than 250° C. for a time of between 1 hour and 24 hours,
wherein the crosslinked molded article is obtained by crosslinking a crosslinkable fluorine-containing rubber composition comprising a fluorine-containing rubber (A) comprising vinylidene fluoride unit, the fluorine-containing resin (B) and a polyol crosslinking agent (C),
wherein the vinylidene fluoride unit in the fluorine-containing rubber (A) is present in an amount of 58 mol % to 85 mol %,
wherein the fluorine-containing resin (B) is copolymer of tetrafluoroethylene/ethylene/2,3,3,4,4,5,5-heptafluoro-1-pentene comprising 2,3,3,4,4,5,5-heptafluoro-1-pentene in an amount of from 0.1 to 5 mol %, or a copolymer of

tetrafluoroethylene/ethylene/1,1,2-trihydroperfluorohexene-1 comprising 1,1,2-trihydroperfluorohexene-1 in an amount of from 0.1 to 5 mol %,
wherein the mass ratio (A)/(B) of the fluorine-containing rubber (A) to the fluorine-containing resin (B) is 60/40 to 97/3,
wherein the fluorine-containing rubber (A) and the fluorine-containing resin (B) are kneading at a temperature of not less than a temperature being lower by 5° C. than the melting point of the fluorine-containing resin (B), thereby preparing the crosslinkable fluorine-containing rubber composition,
wherein the ratio (P IR0.5 1/P IR0.5 2) of peak (P IR0.5 1) of characteristic absorption derived from the fluorine-containing rubber (A) in 0.5 μm depth from the surface of the sliding non-sticking member to peak (P IR0.5 2) derived from the fluorine-containing resin (B) is smaller than a ratio (P IR1.2 1/P IR1.2 2) in 1.2 μm depth.

Assignees

• Takemura Kohei
• Yanagiguchi Tomihiko
• Kawasaki Kazuyoshi
• Daikin Ind Ltd

Inventors

• Takemura Kohei
• Yanagiguchi Tomihiko
• Kawasaki Kazuyoshi

Classifications

• C08K5/13

  Phenols; Phenolates · CPC title

• C08J2315/02

  Rubber derivatives containing halogen · CPC title

• C08K3/22

  of metals · CPC title

• C08J2327/12

  containing fluorine atoms · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title